Elements' tooltips inside overlapping scrollviewers

Question

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.NET3.5

Hi all,

I have two overlapping scrollviewers and I need to show a tooltip for each visible element inside both scrollviewers. The problem is that only topmost scrollviewer's elements show the tooltip. I have googled and I have read some pages like Hit Testing in the Visual Layer without luck.

Here a code example where only the second tooltip is shown (green rectangle):

XML

<Grid Height="100" Width="300">
  <ScrollViewer>
    <Rectangle Fill="Red" Width="100" HorizontalAlignment="Left" ToolTip="Red" />
  </ScrollViewer>
  <ScrollViewer>
    <Rectangle Fill="Green" Width="100" HorizontalAlignment="Right" ToolTip="Green" />
  </ScrollViewer>
</Grid>

Any idea?

Thanks,

Raúl

Posted 3-May-11 1:01am

Raúl Nuño

Updated 3-May-11 1:16am

v2

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Comments

Tarun.K.S 3-May-11 10:48am

Set Panel.ZIndex=1 to the first scrollviewer which will put the scrollviewer up, but you won't be able to see the tooltip for Green rectangle.

Raúl Nuño 3-May-11 11:01am

That's not a solution, I need to show tooltips from both scrollviewers.

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Pete O'Hanlon · Answer 1 · 2011-05-03T09:19:00

As it stands, you can't. The element that gets the tooltip support when the items overlap is the element at the top of the z-order. Basically, the problem here is that the red scrollviewer is overlaid by the blue scrollviewer, so even though you hover over the red rectangle, there is an item with a higher z-order getting in the way and preventing the tooltip service from interacting with the red rectangle.

I am confused as to what you are trying to achieve here - by having overlapping scroll viewers, you show the second scrollbar on top of the first, so you could only scroll the second item anyway.