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dhtmlxGrid - Input text on column header selected by double click

Hello, I'm using dhtmlGrid version 1.5.

I set an input text for filter on one column header, everything works fine but when I double click over the input text,it doesn`t get selected.
How could I select all the input text by double click?
Thanks,

Native selection disabled in grid, if necessary you can re-enable it 
http://dhtmlx.com/docs/products/kb/index.shtml?cat=search&q=2186&ssr=yes&s=onselectstart