The reasons for the slow response could be different. We will appreciate it if you open a new support ticket and send us more information on:
- The hardware you are currently using.
- The version of RadControls of WinForms you have installed.
- The panel bar style you use (OutLookNavPane, ListBar, ExplorerBar or VS2005ToolBox)
If possible, please send us a sample project and the steps to replicate the behavior. We will do our best to help you.
the Telerik team