NodePopupContainer node control

NodePopupContainer nc = new NodePopupContainer();
nc.AttachTo(tree);
 
Node node= new Node();
node.AttachTo(tree);
 
tree.MeasureNodeControl += tree_MeasureNodeControl;
tree.PaintNodeControl += tree_PaintNodeControl;
tree.NodeControlPopupShow += tree_NodeControlPopupShow;
 
// measure the node control content size.
private void tree_MeasureNodeControl(FlexibleTreeView pTreeview, MeasureObjectEventArgs pArgs)
{
  // later we`ll draw the 17x17 pixels red rectangle.
  pArgs.Size = new Size(17, 17);
}
 
// draw the node control as a red rectangle.
void tree_PaintNodeControl(FlexibleTreeView pTreeview, NodeControlDrawEventArgs pArgs)
{
  using (SolidBrush br = new SolidBrush(Color.Red))
  {
    pArgs.Context.Graphics.FillRectangle(br, pArgs.Context.Bounds);
  }
}
 
// provide the popup content.
private void tree_NodeControlPopupShow(FlexibleTreeView pTreeview, PopupShowEventArgs pArgs)
{
  // create a control to show in the popup.
  Button btn = new Button();
  btn.Text = "Click me!";
  btn.Click += btn_Click;
 
  pArgs.PopupContent = btn;
  // Optional: update the PopupContent.Size property to set the popup custom size.
  //pArgs.PopupContent.Size = btn.Size; 
}
 
// handle popup content`s events as for any other control.
private void btn_Click(object sender, EventArgs e)
{
  MessageBox.Show("Button clicked");
}

private NodePopupContainer popupContainer;
 
NodeTextBox tb = new NodeTextBox();
tb.AttachTo(tree);
popupContainer = new NodePopupContainer();
// hide the popup container to show it only on the mouse right click.
popupContainer.Visible = false;
popupContainer.AttachTo(tree);
 
Node node = new Node("Test node");
node.AttachTo(tree);
 
// note that here we didn`t handle the MeasureNodeControl and PaintNodeControl treeview events because we wouldn`t show the node control inside a node.
// handle the mouse down event to show the popup as context menu.
tree.MouseDown += tree_MouseDown;
// handle the NodeControlPopupShow treeview event to provide the popup content.
tree.NodeControlPopupShow += tree_NodeControlPopupShow;
 
void tree_MouseDown(FlexibleTreeView pTreeview, MouseActionArgs pArgs)
{
  if (pArgs.Node != null && pArgs.Button == System.Windows.Forms.MouseButtons.Right)  
  {
    // popup our node control as a treeview`s context menu.
    popupContainer.Popup(pArgs.Node, pArgs.Location);
  }
}
 
// provide the popup content.
private void tree_NodeControlPopupShow(FlexibleTreeView pTreeview, PopupShowEventArgs pArgs)
{
  // create a control to show in the popup.
  Button btn = new Button();
  btn.Text = "Click me!";
  btn.Click += btn_Click;
  pArgs.PopupContent = btn;
 
  // Optional: update the PopupContent.Size property to set the popup custom size.
  //pArgs.PopupContent.Size = btn.Size; 
}
 
private void btn_Click(object sender, EventArgs e)
{
  MessageBox.Show("Button clicked");
}