Node changed IsChecked state itself after Scroll

[Thomas]

I create tree with nodes like in example. When I use scroll on mouse for scrolling up and down Node18 state changed from checked to unchecked and back on GUI. When Nodes18 state is unchecked and I select any node, Node18 state changed to checked on GUI. This is easy to reproduce. I use 2013 Q1 SP1. This code was generated by VS automatically.

 

How do you suggest resolving this?

 

Code example:

    

private void InitializeComponent()
{
  Telerik.WinControls.UI.RadTreeNode radTreeNode1 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode2 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode3 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode4 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode5 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode6 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode7 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode8 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode9 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode10 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode11 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode12 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode13 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode14 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode15 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode16 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode17 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode18 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode19 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode20 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode21 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode22 = new Telerik.WinControls.UI.RadTreeNode();
  Telerik.WinControls.UI.RadTreeNode radTreeNode23 = new Telerik.WinControls.UI.RadTreeNode();
  this.radTreeView1 = new Telerik.WinControls.UI.RadTreeView();
  ((System.ComponentModel.ISupportInitialize)(this.radTreeView1)).BeginInit();
  this.SuspendLayout();
  //
  // radTreeView1
  //
  this.radTreeView1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
        | System.Windows.Forms.AnchorStyles.Left)
        | System.Windows.Forms.AnchorStyles.Right)));
  this.radTreeView1.BackColor = System.Drawing.SystemColors.Control;
  this.radTreeView1.Cursor = System.Windows.Forms.Cursors.Default;
  this.radTreeView1.Font = new System.Drawing.Font("Segoe UI", 8.25F);
  this.radTreeView1.ForeColor = System.Drawing.Color.Black;
  this.radTreeView1.Location = new System.Drawing.Point(12, 12);
  this.radTreeView1.Name = "radTreeView1";
  radTreeNode1.Expanded = true;
  radTreeNode1.Name = "Node1";
  radTreeNode2.Name = "Node2";
  radTreeNode2.Text = "Node2";
  radTreeNode3.Name = "Node3";
  radTreeNode3.Text = "Node3";
  radTreeNode4.Name = "Node4";
  radTreeNode4.Text = "Node4";
  radTreeNode5.Name = "Node5";
  radTreeNode5.Text = "Node5";
  radTreeNode6.Name = "Node6";
  radTreeNode6.Text = "Node6";
  radTreeNode7.Name = "Node7";
  radTreeNode7.Text = "Node7";
  radTreeNode8.Name = "Node8";
  radTreeNode8.Text = "Node8";
  radTreeNode9.Name = "Node9";
  radTreeNode9.Text = "Node9";
  radTreeNode10.Name = "Node10";
  radTreeNode10.Text = "Node10";
  radTreeNode11.Name = "Node11";
  radTreeNode11.Text = "Node11";
  radTreeNode12.Name = "Node12";
  radTreeNode12.Text = "Node12";
  radTreeNode13.Name = "Node13";
  radTreeNode13.Text = "Node13";
  radTreeNode14.Name = "Node14";
  radTreeNode14.Text = "Node14";
  radTreeNode15.Name = "Node15";
  radTreeNode15.Text = "Node15";
  radTreeNode1.Nodes.AddRange(new Telerik.WinControls.UI.RadTreeNode[] {
        radTreeNode2,
        radTreeNode3,
        radTreeNode4,
        radTreeNode5,
        radTreeNode6,
        radTreeNode7,
        radTreeNode8,
        radTreeNode9,
        radTreeNode10,
        radTreeNode11,
        radTreeNode12,
        radTreeNode13,
        radTreeNode14,
        radTreeNode15});
  radTreeNode1.Text = "Node1";
  radTreeNode16.Expanded = true;
  radTreeNode16.Name = "Node16";
  radTreeNode17.CheckType = Telerik.WinControls.UI.CheckType.RadioButton;
  radTreeNode17.Name = "Node17";
  radTreeNode17.Text = "Node17";
  radTreeNode18.CheckState = Telerik.WinControls.Enumerations.ToggleState.Indeterminate;
  radTreeNode18.CheckType = Telerik.WinControls.UI.CheckType.RadioButton;
  radTreeNode18.Expanded = true;
  radTreeNode18.Name = "Node18";
  radTreeNode19.CheckType = Telerik.WinControls.UI.CheckType.CheckBox;
  radTreeNode19.Name = "Node19";
  radTreeNode19.Text = "Node19";
  radTreeNode20.CheckType = Telerik.WinControls.UI.CheckType.CheckBox;
  radTreeNode20.Name = "Node20";
  radTreeNode20.Text = "Node20";
  radTreeNode21.CheckType = Telerik.WinControls.UI.CheckType.CheckBox;
  radTreeNode21.Name = "Node21";
  radTreeNode21.Text = "Node21";
  radTreeNode22.CheckType = Telerik.WinControls.UI.CheckType.CheckBox;
  radTreeNode22.Name = "Node22";
  radTreeNode22.Text = "Node22";
  radTreeNode23.CheckType = Telerik.WinControls.UI.CheckType.CheckBox;
  radTreeNode23.Name = "Node23";
  radTreeNode23.Text = "Node23";
  radTreeNode18.Nodes.AddRange(new Telerik.WinControls.UI.RadTreeNode[] {
        radTreeNode19,
        radTreeNode20,
        radTreeNode21,
        radTreeNode22,
        radTreeNode23});
  radTreeNode18.Text = "Node18";
  radTreeNode16.Nodes.AddRange(new Telerik.WinControls.UI.RadTreeNode[] {
        radTreeNode17,
        radTreeNode18});
  radTreeNode16.Text = "Node16";
  this.radTreeView1.Nodes.AddRange(new Telerik.WinControls.UI.RadTreeNode[] {
        radTreeNode1,
        radTreeNode16});
  this.radTreeView1.RightToLeft = System.Windows.Forms.RightToLeft.No;
  this.radTreeView1.Size = new System.Drawing.Size(260, 238);
  this.radTreeView1.SpacingBetweenNodes = -1;
  this.radTreeView1.TabIndex = 0;
  this.radTreeView1.Text = "radTreeView1";
  //
  // Form1
  //
  this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
  this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
  this.ClientSize = new System.Drawing.Size(284, 262);
  this.Controls.Add(this.radTreeView1);
  this.Name = "Form1";
  this.Text = "Form1";
  ((System.ComponentModel.ISupportInitialize)(this.radTreeView1)).EndInit();
  this.ResumeLayout(false);

}

private Telerik.WinControls.UI.RadTreeView radTreeView1;

 

UPDATE : This causes for node18 because it set as 
radTreeNode18.CheckState = Telerik.WinControls.Enumerations.ToggleState.Indeterminate;

[Julian Benkov]

Hello Thomas,

In the provided example the Node18 is setup to RadioButton check type. To use the CheckBox in TriState mode you must change the CheckType of node to CheckBox:

radTreeNode18.CheckType = Telerik.WinControls.UI.CheckType.CheckBox;

If you want the changing of CheckType to be not controlled by the default parent / child logic for related Nodes you must setup the AutoCheckChildNodes property to false.

radTreeView1.AutoCheckChildNodes = false;

I hope this helps.

Greetings,
Julian Benkov
the Telerik team