In order to set the MinWidth of a pane, you have to set this to the RadSplitContainer. But, you have to set this in the style of the RadSplitContainer. You can very easy edit it in Expression Blend. Just drop a Docking control on the design surface, right-click the SplitContainer and choose from the menu Edit Template-> Edit a Copy
. Then Blend will generate all the needed resources. Change the MinWidth
value from the default of 15 to the desired one. In order to apply the style every time when the Panes are pinned/unpinned, etc you have to set these style implicitly, because the SplitContainers are redrawn when the state of the Pane is changed.
Hope this information helps.
All the best,
the Telerik team
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