Combobox needs to be selected twice to open drop down list when using flexlib's MDI window

[muhammadanasnaeem]

What steps will reproduce the problem?

1. If there are more than one MDI windows in the application as in my case all the windows are either opened or minimized except the one that's containing combobox
2. Now when you click on the combobox after clicking or selecting something on any other window(s) the combobox do's a quick flicker behaviour and i have to click it once again to show the drop down lis.
3. Let's say i have 2 MDI windows and both are opened now i have clicked on one of the window's that's not having combobox and after it I go back on the window containing the combobox and click one of the combobox now it would do a quick flicker behaviour and would not show the dropdown list until i again click on it

What is the expected output? What i see instead?

what I expect is that it should open the dropdown list on first click but I have to click more than one time to open it , as it would normally be opened if I were not using flexlib.

What version of the product I am using? On what operating system?
I am using Flex SDK version 4.6.0 and Flash Player version to be 11,2,202,235.

Additional information below.

If you close all the MDI windows except the one with combobox and now you click on the combobox its behaviour is normal now or the result is correct.