ribbon.cs

public Form1()
{
    InitializeComponent();

    textControl1.InputPositionChanged += TextControl1_InputPositionChanged;
    textControl1.FrameSelected += TextControl1_FrameSelected;
    textControl1.FrameDeselected += TextControl1_FrameDeselected;
    textControl1.DrawingActivated += TextControl1_DrawingActivated;
    textControl1.DrawingDeselected += TextControl1_DrawingDeselected;

    m_rbtnLoad.Click += M_rbtnLoad_Click;
    m_rbtnSave.Click += M_rbtnSave_Click;
}