I am recently working on a project with MDI and many MDI child Forms.

 

For the application demands, I have to use SendMessage API to change the MDI Child Form Icon  several times. ( same one in runtime without reopenning)

 

Here are the steps

 

1. In design time,  I don't set any icon to the MDI child Form.

 

2. in the Form_load events, do the sendMessage once, the form icon and related tab icon are changed well.

 

3. after going running some precedures,  do SendMessage again without any manual handle , the form icon and tab not changed .

 

4. Mouse click somewhere in the form, the form icon changed, tab icon not changed.

 

5. click on the tab, the tab icon changed.

 

Please kindly tell me how can I automatically refresh the tab icon and form icon immediately once do sendMessage?

 

 

PS: Is there possible to add a botton beside WorkSpace Tab Stripper or trap the event of clicking on blank space in the tab Stripper just like IE 7?