How to load a form without radiobutton selected in C++ Winforms?

Question

Friends, I have a doubt, although I have tried many times and got no result. I have a grouBox with 10 radiobutton. When I load the program, radiobutton 1 is always selected. I need no radiobutton to be selected. I tried with the following code but it didn't work. Where would the problem be? I put this code in frmload.

			for each (Control ^ ctl in groupBox1->Controls)
			{
				RadioButton^ rb = dynamic_cast<RadioButton^>(ctl);
				if (rb->Checked)
					rb->Checked = false;
			}

Answer 1

Like in another thread, it works for me in Form1_Shown