How do I manipulate a control in a dialog?

[Homunkulus]

I am using: "dialogH = CreateDialog(NULL,MAKEINTRESOURCE(IDD_DIALOG),NULL,MessageHandler);" to create a moddless dialog.

With: "SetWindowText(GetDlgItem(dialogH, IDC_EDIT1),strText);" I am able to put text in a control.

Now i want to deactivate some controls and turn some option fields on or off...but i dont know how

For example: How do I deactivate the control IDC_BUTTON?
And how do i turn the option field IDC_RADIO on?

hope you can help me
thx

 

[BlackHorus]

use EnableWindow(GetDlgItem(...,...),FALSE) to deactivate
it, and ShowWindow(..) to hide it