Inline Editor combo box problem,need twice click

Here is an example of combo box

The first click just disappeared in a flash.

The second click will select.

Why? help me

We are aware of that issue. The dev team will fix it in the future, but I cannot give you any ETA.

Now, as a workaround, you can return false in the onTaskClick event if you click on the dropdown element:

gantt.attachEvent("onTaskClick", function(id,e){
    if( == "select")
    	return false;
  	return true;

Here is the updated snippet:

The bug should be fixed in the 7.0.10 version: