About Accessing or Retrieve all the controls in a window form

Hi,

   I want to get the controls inside a tab page or group box which is in a windows forms in C#.
Ex:
foreach(Controls ctrl in tabPage1.controls)
{
if(ctrl is Label)
{
my code is here
}
}
Above code is the written by me for accesing Label Controls in my form.But i cant retreive Label Control Because it is inside the tabpage.
Is there any solution for this without specifying Groupbox1.Controls or tabpage1.controls

Plesae help me with the code

Thanks
Subash