Problem about "Enter" the control after switch windows !

[Ken Yu]

Hi,

I have one big problem, detail as below :

I created "Form01" for main MdiContainer (IsMdiContainer is Enable), I tried
to open "Form02" by MainMenu under the MdiContainer, it have two button
"Button01 & Button02", and have three TextBox "TextBox01, TextBox02 &
TextBox03", the cursor is focus on "Button01", I open "Form03" by MainMenu
under the MdiContainer, the problem is when i close "Form03" and tried to
press "Enter" on any control in "Form02", it only display the message from
"Button01" ! Same as locked the keydown focus in "Button01".

Any Body know how to fix it ????