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Off the top of my head I can't think of any.
The contents of the child are dependent on the value chosen in the parent, so if the choice of the child changed the choice (or worse changed the values) of the parent, then that could change the values available in the child, which could cause a change in the parent... A touch recursive... 
Never underestimate the power of stupid things in large numbers
--- Serious Sam
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Enlightenment indeed 
If you have built castles in the air, your work need not be lost; that is where they should be.
Now put foundations under them.
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The only reason I can think of where the reverse control may be an option is where the child menu wants to 'go back' or 'remove filter' etc.
e.g.
parent options = {BMW, Mercedes, All}
child options = {[318,320,540,M3,M5,Remove Filter],[220,C63, SLS,Remove Filter]}
Selecting Remove Filter in the child options, might select the 'All' in the parent.
Just off the top of my head, probably would never actually want to do that, but that's what jumped out of the grey matter....
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Nice thought Thanks.
If you have built castles in the air, your work need not be lost; that is where they should be.
Now put foundations under them.
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It would per definition not be a child any more.
I must admit that I've worked with controls that filter each other. And as far as I'm concerned, that's an idiocy that only a certain kind of managers can come up with.
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I have used multiple combo boxes (for different criteria) to filter a dataset. Depending on how fancy you want to make your logic, you could assign Parent/Child relationships on the order selected...either that or allow the user to possibly select an invalid combination.
"Go forth into the source" - Neal Morse
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My heart leaps up when I behold
A rainbow in the sky:
So was it when my life began;
So is it now I am a man;
So be it when I shall grow old,
Or let me die!
The Child is father of the Man;
I could wish my days to be
Bound each to each by natural piety.
So, according to Wordsworth, it depends on how they're bound.
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Jean Paul, moved to Texas and bought a donkey from an old farmer named Ben for $100. The farmer agreed to deliver the donkey the next day.
The next day, Ben drove up and said, "Sorry, but I have some bad news. The donkey died." "Well, then, just give me the money back," said Jean Paul.
"Can't do that. I went and spent it already." replied Ben. "OK, then. Just unload the donkey," said Jean Paul.
"What ya going to do with him?" asked Ben. "I'm going to raffle him off," said Jean Paul. "You can't raffle off a dead donkey!" uttered Ben. "Sure can. Watch me. I just won't tell that he's dead," said Jean Paul.
A month later Ben met up with Jean Paul and asked, "What happened with that dead donkey?" "I raffled him off, I did. I sold 500-hunderd tickets at two dollars apiece and made a profit of $898," said Jean Paul. "Didn't anyone complain?" inquired Ben.
"Just the guy who won. So I gave him his two dollars back", said Jean Paul.
/ravi
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An oldie but a goodie! 
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I broke down and ordered a Beagle Bone Black[^] as opposed to the RaspberryPi which so many on here have. I did a lot of research before ordering and the BBB I believe has more to offer a hobbyist like myself that has experience with the Arduino line of uControllers.
Now the bad news, it is on back order until Jan. 5. No one has any. 
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Well, that's ok - nobody will be back before then anyway!
It looks interesting: what are you planning to do with it? And what language?
Never underestimate the power of stupid things in large numbers
--- Serious Sam
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OriginalGriff wrote: Well, that's ok - nobody will be back before then anyway!
Yeah but, but...
OriginalGriff wrote: It looks interesting: what are you planning to do with it? And what language?
I don't really have a project in mind just want to learn and play.
I will probably do some C/C++ but really want to do some Python development, still in the early learning stages but I think I should be able to get up to speed fairly quickly.
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On arrival in the toon I stepped out of the car and there at my feet was a condom (used) as a greeting.
After walking around I am shocked ny what people are wearing - coats.
speramus in juniperus
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whey that playas has changed!!! You sure they're locals wearing those coats??? Must be tourists 
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Nagy Vilmos wrote: and there at my feet was a condom (used) as a greeting.
Newcastle? Perhaps it was twice used.
If there is one thing more dangerous than getting between a bear and her cubs it's getting between my wife and her chocolate.
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The important question is: what are you doing in the Frozen Wastelands north of Watford?
Never underestimate the power of stupid things in large numbers
--- Serious Sam
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If they are wearing coats, you've probably arrived at Teesside. Look up, if there is a thick orange smog, you need to continue North until someone asks for 20p for the Metro so they can get their diabetes medicine.
[Edit]
Corrected auto-correct.
modified 29-Dec-13 19:03pm.
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A belated Christmas gift - Merry Christmas[^], old friend! 
If that doesn't give you a few ideas, nothing will!
Will Rogers never met me.
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PETA is going to go topless over this
“I'm an artist: it's self evident that word implies looking for something all the time without ever finding it in full. It is the opposite of saying : 'I know all about it. I've already found it.'
As far as I'm concerned, the word means: 'I am looking. I am hunting for it. I am deeply involved.'”
Vincent Van Gogh
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I sure hope so, Bill! Although most of them are rather unlovely by any definition, a few might look rather fetching in nothing at all, and I'd appreciate seeing them in such a state. Particularly on a chilly day, if only to have a good excuse to offer one such lass a warm fur wrap to keep her wimples narm.
Will Rogers never met me.
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Ah - thank you, I like surprise pressies!
It was filmed not far from here!
Never underestimate the power of stupid things in large numbers
--- Serious Sam
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Was i you in the wolf costume??? 
Anything that is unrelated to elephants is irrelephant
Anonymous
-----
The problem with quotes on the internet is that you can never tell if they're genuine
Winston Churchill, 1944
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I'd just like a chance to prove that money can't make me happy.
Me, all the time
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Can I please have coal instead? No matter how bad I have been, I don't deserve a root canal 
Soren Madsen
"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty
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![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
Just think how good you'll feel when it's all behind you.
/ravi
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Thanks, but I actually feel fine. The tooth tingles once in a while, that's all. I was surprised when the dentist said I need a root canal. Tomorrow. He is going on vacation and needs a little extra cash. 
Soren Madsen
"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty
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