Treeview ExpandAll on Load

[kuul13]

Hi

I am using a treeview in my windows form and having trouble expanding it by default. I have placed a treeview control on a panel and programatically added/loaded the tree nodes using
public frmDashBoard()
{
InitializeComponent();
LoadTreeview();
}
Treeview looks like..
+ParentNode
+Child1
+Child2
Issue is that after I populate the treeview I am not able to expand the treeview at all. I tried putting the following code in every **** place i can think off..
tvwAttributes.ExpandAll();
This statement works fine if called from click event of a command button but doesn't work anywhere else. I want the treeview to expand always. Please guide me what am doing wrong.. Thanks in advance!

[Phil Weber]

This code works fine for me:

using System;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;

namespace MyApp
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);
            InitializeTreeView();
        }

        // Populates a TreeView control with example nodes. 
        private void InitializeTreeView()
        {
            treeView1.BeginUpdate();
            treeView1.Nodes.Add("Parent");
            treeView1.Nodes[0].Nodes.Add("Child 1");
            treeView1.Nodes[0].Nodes.Add("Child 2");
            treeView1.Nodes[0].Nodes[1].Nodes.Add("Grandchild");
            treeView1.Nodes[0].Nodes[1].Nodes[0].Nodes.Add("Great Grandchild");
            treeView1.Nodes.Add("Parent");
            treeView1.Nodes[1].Nodes.Add("Child 1");
            treeView1.Nodes[1].Nodes.Add("Child 2");
            treeView1.Nodes[1].Nodes[1].Nodes.Add("Grandchild");
            treeView1.Nodes[1].Nodes[1].Nodes[0].Nodes.Add("Great Grandchild");
            treeView1.EndUpdate();
            treeView1.ExpandAll();
        }
    }
}

[kuul13]

Hi Phil

Thanks for the response.. I guess there is something really worng the way I am coding.. When I try to run your code standalone, it works great. As soon as I place it in a MDIForm it fails to expand automatically.

Main Program Code
static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
//Application.Run(new CDIM.Tracker.Modules.frmDashboard());
Application.Run(new TrackerMDI()); //Calling MDI
}
}

MDI Form code
public TrackerMDI()
{
InitializeComponent();

Form1 objForm1 = new Form1(); //This is the form that has treeview
objForm1.Visible = true;
objForm1.MdiParent = this;
objForm1.Show(); //Shows treeview without expanding any node
}

Form1 has the code sent by you.

What can be the problem with MDIForm???

[kuul13]

Thanks to everyone for looking into this problem.. I was able to solve this with the help of my friend.

Only thing that we did in the code is:
We removed the following statement from MDI Form code public TrackerMDI()
objForm1.Visible = true;

Not sure how that impacted but it solved my problem