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Problem with Tabbar and DHTMLXWindows

hi,
I have two problems:

1- I have to load a Tabbar via and XML and I want to attach Grid to one of the tabs. below is the code which I am using
function create()
{
dhxWins1 = new dhtmlXWindows();
dhxWins1.setImagePath(imgPathWindow);
GUIToolsWin = dhxWins1.createWindow("GUIToolsWin", 240, 50, 600, 500);
Tabs = GUIToolsWin.attachTabbar();
Tabs.loadXML('tabbar.xml');

// Later I try to attach a grid with a tab.
mygrid = Tabs.cells(dhxWins1,"TestTab").attachGrid();
}
The problem is that the grid is not getting attached to the tab. In fact the tab is not getting created at all. please help.

2- The above function is called when i select a menu item named "Debug" from the menu. when i first time click on Debug, the
GUIToolsWin.show() menthod is working and it is displaying the window, but when I click on the menu item again the same
GUIToolsWin.show()method is throwing an error "Object doesn't support this property or method".

Thanks in anticipiation.
Meenakshi