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grid button with mouse click

hello!

i put one colmn buttons in a grid, and set some buttons to disabled, however, problem comes.

i got problem as follows:

1) press mouse left key in an enabled button, and do not release.
2) move the mouse to a disabled button.
3) release the mouse.

some time, it was normal and selected one row, but some time it got a problem.

the error message from the ie7 is " 'tagName is NULL or not a object.'", and the error is coming from line 150, dhtmlxgrid.js.

how can i do with it? please give me some suggest, thanks a lot!