private void btPowerOn_Click(object sender, EventArgs e)
    {
        Color colour;
        ButtonPower buttonpower = new ButtonPower(this);
        var button = sender as Button;
        buttonpower.buttonOnOff(button.Name, Convert.ToByte(this.lvVMs_1.SelectedItems[0].Group.Header));
      } //<-- Following this the listview has no focus.

// lvVMs_1
        //
        this.lvVMs_1.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
        | System.Windows.Forms.AnchorStyles.Left)));
        this.lvVMs_1.AutoArrange = false;
        this.lvVMs_1.Font = new System.Drawing.Font("Microsoft Sans Serif", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
        this.lvVMs_1.HeaderStyle = System.Windows.Forms.ColumnHeaderStyle.None;
        this.lvVMs_1.HideSelection = false;
        this.lvVMs_1.LabelWrap = false;
        this.lvVMs_1.Location = new System.Drawing.Point(8, 25);
        this.lvVMs_1.MultiSelect = false;
        this.lvVMs_1.Name = "lvVMs_1";
        this.lvVMs_1.Size = new System.Drawing.Size(280, 651);
        this.lvVMs_1.TabIndex = 52;
        this.lvVMs_1.UseCompatibleStateImageBehavior = false;
        this.lvVMs_1.View = System.Windows.Forms.View.Tile;
        this.lvVMs_1.SelectedIndexChanged += new System.EventHandler(this.lvVMs_1_SelectedIndexChanged);