Hi all,

I have three questions about gridpanel column header events:

1)I try to call a function whenever a column header is clicked. In the previous version of ExtJS, there was headerclick event in gridpanel. But now i found this event in Ext.grid.column.Column. I set this event as a column event but it never called:

Code:
columns:[{
 //other properties
listeners:{
 headerclick:function(){}
}
}
]

2) I could not find any event that is triggered before any column header is moved like beforemove.How can i implement such an event? I also wonder if i can drag drop column header into a textbox.

3)When header grouping is used, i can move a column into a group or i can move a group header into another group header which is absurd in my case. I need to make impossible to drag a group header into another group header. This question is actually related with my second question.