which control has currently the focus in a MDI-Form

so u have a mdi form and child forms in it and u want to know which control is focused on the child form?
well u have to run an foreach loop of arrays of forms and them a foreach loop for every contol in the form..
Please make any corrections because i am too tired and sick. i cannot refer to visual studion to provide u the 100% correct code
something like this..
Any thing i have replaced by ' ' is not exactly correct
foreach(Form form in 'mdiForm.ChildForms')
{
foreach(Control ctrl in form.Controls)
{
if(ctrl.focused==true)
{
//What to do if a focused control is found?
}
}
}
 i hope this helps u.