Collapsed Visibility Within a WPF ComboBoxItem
- by user832747
I used a Style setter to stretch out my ComboBoxItem (and button) so that it spans the entire length of the ComboBox like so:
<ComboBox >
<ComboBox.Resources>
<Style TargetType="ComboBoxItem">
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
</Style>
</ComboBox.Resources>
<ComboBoxItem >
<DockPanel >
<Button Content="My Button" />
</DockPanel>
</ComboBoxItem>
</ComboBox>
This works fine. Now, I add an additional button within the same ComboBoxItem, but have it set to Visibility Collapsed.
<ComboBox >
<ComboBox.Resources>
<Style TargetType="ComboBoxItem">
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
</Style>
</ComboBox.Resources>
<ComboBoxItem >
<DockPanel >
<Button Content="My Button" />
<Button Content="My Collapsed Button" Visibility="Collapsed" />
</DockPanel>
</ComboBoxItem>
</ComboBox>
Now, the new button is invisible, but I expected my original button to still stretch the entire ComboBox, like it does with the above code. However, it does not. Why is this so? Is there a solution for this? I am using DataTriggers to edit the Visibility property.
NOTE: I also get the same thing if I just set HorizontalContentAlignment="Stretch" in the ComboBox.
UPDATE: Ok, this actually has something to do with the DockPanel. I changed it to a StackPanel, and it works as desired. However, I suppose I'm still curious as to why my first button would not stretch the entire DockPanel if the second button is collapsed?
