Как принудительно обновить Content pane ?

[ansoft]

А почистить кэш не пробовали до того как...

void workspaceWindowDestroyed(int _hWnd)
{
...
// This method is called when a workspace window is destroyed
// here workspace related resources can be cleaned up
if (workspaceCacheMap && workspaceCacheMap.exists(_hWnd))
{
// clean up the workspace cache object. This is created in the
// workspaceCache() function.
workspaceCacheMap.remove(_hWnd);
}