we are creating a xui-window with acl on the fly if the user clicks on a button. The content of the xui window is a listbox with listitems.
Now we want to dock the xui-window to the bottom of the Arbortext Editor window. We are doing this with enabledocking="any" and dock="bottom". So far this is the desired behaviour. But if the user clicks again on the button, we get errors from acl with the function window_show() Argument #1 "no valid window-id". Probably the reason for this is that we try to open again a xui-window until the other xui is opened.