Combo box events

[C# Programming]

Hi i have come across a problem using combo box events


private void comboBox1_KeyPress(object sender, KeyPressEventArgs e)
{
if (Control.ModifierKeys == Keys.Delete)
{
imageViewer1.DeleteSelectedShape();
}
}

private void comboBox1_MouseDoubleClick(object sender, MouseEventArgs e)
{
comboBox1.Text = "hello";
}


For some reason the above code is not fired, it is probably a simple constraint i do not know about but can anyone see why this is would not fire.

Thanx in advance