[Solved] Decreasing thumb height when dragging it down

[Roman]

Hi,
I use RadGridView with EnableRowVirtualization="True". ItemsSource is VirtualQueryableCollectionView. GridView contains rows with details(RowDetailsVisibilityMode="Visible"). When VerticalScrollBar from GridView scrolled down(dragging the thumb by mouse),  the size of the thumb is decreased.

I investigated that ScrollableHeightPropertyKey calculated without adding detail height at first time then ScrollableHeightPropertyKey is increased by details height(from visible area). ScrollableHeightPropertyKey is private property so i can't affect on it.

The ScrollableHeightPropertyKey growing when i dragging the thumb down(details from visible area). When i arrived to the end of the GridView the thumb size stabilized.
I tried to use ScrollMode="Deferred" but the issue is the same.

Xaml:

<controls:RadGridView x:Name="TK"
         EnableRowVirtualization="True"
         ScrollMode="RealTime"
         IsFilteringAllowed="False"
         RowDetailsVisibilityMode="Visible"
         IsSynchronizedWithCurrentItem="False"
         ItemsSource="{Binding TestCollectionView}"
         RowDetailsTemplate="{StaticResource TestDetailTemplate}">
...
</controls:RadGridView>

When i don't use row virtualization the thumb size stay the same.
Or if i use RowDetailsVisibilityMode="VisibleWhenSelected" also the thumb size staying the same.

Is it possible to overcome this situation?

Thanks to all,
Roman Denysenko

[Vlad]

Hi Roman,

 When the grid EnableRowVirtualization is off all row details will be loaded initially and that is why the total height will be correct. In case of row virtualization the grid will load every row details on demand and the total height will be changed on demand as well. You can define some estimated height in RowHeight to avoid big changes in the total height of the grid.

Regards,
Vlad
the Telerik team

[Roman]

Hi Vlad,
I was trying to set RadGridView.RowHeight  equal to row without detail plus height of detail.
But in this case height of row without detail become like row plus detail height. I have the same problem in result.

Best regards,
Roman Denysenko

[Roman]

Hi,
Do you have some other solutions for this behavior?

Thanks to all,
Roman Denysenko

[Roman]

Hi,

The same situation with column virtualization. When i scroll horizontal scroll bar the thumb size changes also.

Regards,
Roman Denysenko