C#

<br />
using (MyForm myForm = new MyForm())<br />
{<br />
	myForm.ShowDialog();<br />
}<br />

public partial class Form1 : Form
     {
     ADVANCEIS.Controls.GlossContourButton B1, B2, B3, B4, H5, H6, H7; // ETC. - H5..7 BUTTONS TO BUILD INTO A TOGGLE GROUP.
     List<ADVANCEIS.Controls.GlossContourButton> ToggleGroup_GlossButton = new List<ADVANCEIS.Controls.GlossContourButton>( ); // LIST FOR TOGGLE GROUP.

     public Form1( )
          {
          InitializeComponent( );

          // OTHER CODE REMOVED. CREATE MEMBERS OF TOGGLE GROUP AND ASSIGN TO ToggleGroup_GlossButton.

          H5 = new ADVANCEIS.Controls.GlossContourButton( );
          H5.SetBounds( H4.Bounds.X + w1 + ( w1 / 2 ), t, w1, w1 );
          this.Controls.Add( H5 );
          H5.Click += GlossButtonToggleGroupHandler;
          ToggleGroup_GlossButton.Add( H5 );

          H6 = new ADVANCEIS.Controls.GlossContourButton( );
          H6.SetBounds( H5.Bounds.X + w1, t, w1, w1 );
          this.Controls.Add( H6 );
          H6.Click += GlossButtonToggleGroupHandler;
          ToggleGroup_GlossButton.Add( H6 );

          H7 = new ADVANCEIS.Controls.GlossContourButton( );
          H7.Down = true;
          H7.SetBounds( H6.Bounds.X + w1, t, w1, w1 );
          this.Controls.Add( H7 );
          H7.Click += GlossButtonToggleGroupHandler;
          ToggleGroup_GlossButton.Add( H7 );
          }


     // HOW TO DO A TOGGLE GROUP - CLICK IS ASSIGNED THIS HANDLER; OTHER CODE CAN BRANCH ON SENDER.

     public void GlossButtonToggleGroupHandler( object sender, EventArgs e )
          {
          ADVANCEIS.Controls.GlossContourButton s = sender as ADVANCEIS.Controls.GlossContourButton;

          if ( null != s )
               {
               foreach ( ADVANCEIS.Controls.GlossContourButton b in ToggleGroup_GlossButton )
                    {
                    if ( s == b )
                         s.Down = true; // Here, you have identified the sender and can branch to other processes.
                    else
                         b.Down = false;
                    }
               }
          }