When the window of an application that has a TabControl with Left/Right TabStripPlacement is resized, the measure of the TabStrip is incorrect and the ScrollButtons are in Disabled state. All Tabs should be visible when the window is in its normal state and should be scrollable.
Inherit RadTabControl and override
protected override void OnScrollButtonsVisibilityChanged()
if (this.ScrollViewer != null)
RadDockPanel parentDock = this.ScrollViewer.Parent as RadDockPanel;
if (parentDock != null)
// Dispatcher is because Measure should be called outside other Measure phase.
this.Dispatcher.BeginInvoke(new Action(() =>