Questions on UI for WinForms Forum

0 answers

62 views

Item expanded property

Hello~~

I am find gantt item default expand property

void Init()

{

//current using this way

// I want gantt Items default expand is false

DataSet ds = New DataSet();

gantt.DataSource = ds;

foreach(item in gantt.Items)

{
item.expand = false;

}

GanttView

asked on 11 May 2018

1 answer

112 views

When using EnableHeaderCheckBox, sorting the header columns does not work

I am using the EnableHeaderCheckBox to have a "Select All" checkbox in the header of my boolean column. I have the radgridview.EnableSorting = true and they work just fine, but when I click the "Select All" header checkbox and then try to sort any column, they do not sort at all. It does nothing. I am using Telerik UI for Winforms version 2017.2.502. Can someone please help?

GridView

answered on 10 May 2018

1 answer

128 views

An exception occurs when working with a font

I use the font property when working with RadPropertyGrid.

My user entered a font size of -1. An exception is thrown and the program falls.

For comparison in the PropertyGrid (WinForms), this situation is correctly handled.

PropertyGrid

answered on 09 May 2018

1 answer

262 views

Hide Item, Show Item?

I can hide a layout item using HideItem() method but then how do I make it visible again?

LayoutControl

answered on 09 May 2018

4 answers

2.8K+ views

cancel form close with FormClosing

I think I read how to do this but searching 'FormClosing' in this forum didn't find anything much.

I simply need to cancel the closing of a form (after user dialog confirmation). Is this the correct approach?

private void OnFormClosing(object sender, FormClosingEventArgs e)

{

var dlg = new DlgConfirmUnsavedForm();

var result = dlg.ShowDialog();

if (result == DialogResult.Cancel)

{

e.Cancel = true;

OnClosing(e);

return; //??

}

else if (result == DialogResult.Yes)

{

SaveForm();

}

...

}

By the way, post editing is terrible!

Form

answered on 09 May 2018

3 answers

140 views

Excel Addin hangs when MCCB is scrolled

Hi,

I've a problem (again) when the MCCB is used in an Excel addin environment.

If the MCCB is used on a normal form (non modal) and you scroll (mouse wheel) inside the dropdown (grid) then the complete addin hangs.

If you do the same in an modal form, everything works fine.

Sample project is attached (rename to zip)

Steps to reproduce:

    button2 -> opens modal form (OK)
  button1 -> opens non modal form (not OK)
  open dropdown and then scroll inside grid with mouse wheel

Is there any workaround? (even if I have to disable mouse scrolling, would be better than an hanging application)

MultiColumn ComboBox

answered on 08 May 2018

5 answers

145 views

RadForm

Isn't there any way to add an extra button to the caption form like the help button without making the form border style (None)

General Discussions

answered on 08 May 2018

3 answers

101 views

Running form as Dialog from Treeview DragEnded event stuck sometimes

I'm using two RadTreeView to Drag and Drop Nodes from Right to Left. When "Node 1" is Drag from Right and Drop to Left RadTreeView a Dialog is shown.
If I Drag and Drop other Node before "Node 1" the Dialog stuck and I cannot write on the TexBoxes.

How can I solve this issue?

Main Form

https://i.stack.imgur.com/Qf1QM.png

public partial class Main : RadForm

{

public Main()

{

InitializeComponent();

}

private void RightRadTreeView_DragEnded(object sender, RadTreeViewDragEventArgs e)

{

if (e.Node.Text == "Node 1")

{

new RadForm1().ShowDialog();

}

private void Form1_Load(object sender, EventArgs e)

{

//Right

this.RightRadTreeView.Nodes.Add(new RadTreeNode { Text = "Node 1" });

this.RightRadTreeView.Nodes.Add(new RadTreeNode { Text = "Node 2" });

this.RightRadTreeView.Nodes.Add(new RadTreeNode { Text = "Node 3" });

this.RightRadTreeView.Nodes.Add(new RadTreeNode { Text = "Node 4" });

}

Dialog Form

https://i.stack.imgur.com/hH7Ln.png

Treeview

answered on 08 May 2018

3 answers

255 views

RadTreeView hangs after click

Hello there,

I have a telerik tree view with tens of thousands of nodes (around 190k). When I load this in most computers, it works ok, sometimes it takes a few seconds to open nodes, but that's acceptable for the number of nodes.

But, in some Windows 10 computers (not all of them), the tree takes more than 20 min to respond, if it ever does. This happens when clicking anywhere in the tree component (expand buttons, nodes, scrollbar...).

One of the computers details where it hangs is:

Windows 10 Enterprise (64 bit). Version 1703.
.NET 4.7.1
Telerik 2018.1.116.40
The laptop has a touch screen

After debugging I found the tree is stuck in GetChild() method (it loops through all the nodes, several times), from RadTreeViewAccessibleObject (attached call stack). This seems to come from windows messages.

Checking in computers where the tree doesn't hang, this call never happens, which makes me think it's a problem with the implementation of windows messages, in some specific version of windows + hardware.

Any ideas on how to fix or bypass this?

Treeview