Since you are using a RadWindow to display the edit form of RadGrid, another possible approach to resolve your problem is to attach a handler for the OnClientShow
client-side event of the window, as shown in this help article
. In the handler function you can
reference the client-side object of the slider and call its function repaint()
I hope this helps. If you are still experiencing difficulties after trying the suggestion above, please try preparing a simple, fully runnable page that shows just your approach for displaying the custom grid edit form and send it via a new support ticket so that I can inspect your case and provide a more to the point answer.
All the best,
the Telerik team
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