WPF ListBox scrollbar problem

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C#

XAML

WPF

Hi all

I ran odd problem with listbox and its scrollbar.

I have Wpf usercontrol which contains 2 rows. First row contains textboxes and combobox and in second row contains only listbox filled with dataclass.
The dataclass is presented in listbox trough itemtemplate which contains border, textblocks and image. I have no problem with presenting my class and itemtempalates works just fine, but when I have multiple objects in my dataclasses (let say eg. 100) so my listbox doest fit my window anymore so scrollbar is needed but It doesnt show!?

I have tried to set usercontrols rowheigth to 'auto', forced to show listbox verticalscrollbar, I have even wrapped listbox inside scrollwiever but every time scrollbar remains disabled or is not showed at all.. so I think something tells to my listbox that it has enough space.. Only Solution I have found is set listbox height to known size but that is not a option.

I made simple demo of my problem

Xaml:

<grid>
    <listbox grid.row="0" x:name="testlistbox" itemssource="{Binding}" scrollviewer.verticalscrollbarvisibility="Auto" xmlns:x="#unknown">
        <listbox.itemtemplate>
            <datatemplate>
                <grid>
                    <border borderthickness="2" borderbrush="Blue" cornerradius="10" margin="10" padding="10">
                        <stackpanel>
                                <textblock text="SampleText"></textblock>
                                <textblock text="SampleText"></textblock>
                                <textblock text="SampleText"></textblock>
                        </stackpanel>
                    </border>
                </grid>
            </datatemplate>
        </listbox.itemtemplate>
    </listbox>
</grid>

Code:

 Collection<int> SampleCollection = new Collection<int>();

            for (int i = 0; i < 30; i++)
            {
                SampleCollection.Add(i);
            }

            testlistbox.ItemsSource = SampleCollection;
</int></int>

Im sure that there is easy answer to this, but I havent found it.

UPDATE: I just found out that this code works just fine in wpf window BUT in usercontrol the problem remains.. This really confuses me.

UPDATE2: Well this is kinda shame to me, but the problem lied in layout than in listbox itself. I think this case is closed. Thanks all!

I hope you got idea :)

Cheers!