Steps to reproduce

1. run a combobox

       <combobox readonly="true"> 
         <comboitem label="item1"/> 
         <comboitem label="item2"/> 
         <comboitem label="item3"/> 
       </combobox>
   

2. click the combobox button to open it
3. click the combobox button to close it

actual result

The combobox doesn't close it.

debug information

• this issue doesn't happen in 7.0.4