When a RadSplitContainer with Orientation="Vertical" contains RadPaneGroup instances, resizing them causes a flicker when the ShowResizePreview property is set to False. This happens with the VisualStudio2019 theme.

For the time being, a possible workaround is to create a global Style with TargetType="RadPaneGroup" and set the Margin property to "0":

<Style TargetType="telerik:RadPaneGroup" BasedOn="{StaticResource RadPaneGroupStyle}">
    <Setter Property="Margin" Value="0"/>
</Style>

Hello Support,

I have some hidden panes (see attachement). The Problem is that when I try to reorder and save the layout and reload it, the panes are not ordered as wished.

I there a way to provide it?

Best regards,

Frédéric Le Blay.

This also causes the initial DataContext to be left out in the memory.
Available in LIB version 2015.3.1214, it will be also available in the 2016 Q1 Release.

Calling the LogicalTreeHelper.GetChildren() does not include the DocumentHost and its contents.
Available in LIB version 2015.3.1214, it will be also available in the 2016 Q1 Release.

When the DropDownDisplayMode of the RadPaneGroup is set to Visible and that group is placed inside the DocumentHost calling the RemoveFromParent from a button places in the HeaderTemplate of the RadPane causes that RadPane instance to not be removed from the memory.

Available in LIB version 2016.3.1107, it will be also available in the 2017 R1 release.

Available in LIB version 2016.3.1107, it will be also available in the 2017 R1 release.

workaround:
add the following visual state to the DocumentHostTemplate of the RadPaneGroup:

<VisualStateManager.VisualStateGroups>
    <VisualStateGroup x:Name="DropDownDisplayStates">
        <VisualState x:Name="DropDownButtonCollapsed" />
        <VisualState x:Name="DropDownButtonVisible">
            <Storyboard>
                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="DropDownButtonElement" Storyboard.TargetProperty="Visibility">
                    <DiscreteObjectKeyFrame KeyTime="0">
                        <DiscreteObjectKeyFrame.Value>
                            <Visibility>Visible</Visibility>
                        </DiscreteObjectKeyFrame.Value>
                    </DiscreteObjectKeyFrame>
                </ObjectAnimationUsingKeyFrames>
            </Storyboard>
        </VisualState>
    </VisualStateGroup>
</VisualStateManager.VisualStateGroups>

and remove the trigger targeting the drop down button.