One of the following errors was shown on the browser at run-time:

TypeError: undefined
ReferenceError: undefined

If you have specified client-side event handlers, make sure the handlers are declared at the top of the page, or before the </form> tag.

For example, if you have specified OnClientPanelResized="PanelResizedHandler" in a WebSplitterContainer, the JavaScript function 'PanelResizedHandler' must be declared before the ZeeControls' page initialization rountine is executed.  On page initialization, WebSplitter will resize the FitWindow container, if any. This, in turn, will resize the panels within that container, and the OnClientPanelResized handler will be called.

ASP.NET will insert ZeeControls' page initialization rountine right before the </form> tag. So the event handler should be declared before the </form> tag.