private void textureBrushToolStripMenuItem_Click(object sender, EventArgs e)
 {
     this.gDIToolStripMenuItem.ForeColor = Color.White;
     if (txtBrush == null)
     {
         txtBrush             = new Texture_Brush();
         txtBrush.MdiParent   = this;
         txtBrush.FormClosed += new FormClosedEventHandler(txtBrush_Close);
         txtBrush.Show();
     }
     else
     {
         txtBrush.Activate();
     }
     txtBrush.WindowState = FormWindowState.Maximized;
 }
 private void txtBrush_Close(object sender, FormClosedEventArgs e)
 {
     txtBrush = null;
 }