I will not get into all the details explaining the problem, but basically, the Xceed.UI.ThemedControl.ConeControl method does not work well in this case, which is why we recommend using our own Clone method. So you need to change the CreateControl method in your derived class for the following :
protected override Control CreateControl()
return ( this.TemplateControl as WinTextBox ).Clone() as Control;
If you derive from WinTextBox to create your WinAmountCellEditorManager and you have other things to clone, you will also need to override the Clone method and add what you need to do in it.
Imported from legacy forums. Posted by André (had 3910 views)