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1 answer
14 views

I like to display data like above . Each row's data type could be decimal, integer, or string. Thanks!

Nadya | Tech Support Engineer
Telerik team
 answered on 01 Apr 2024
1 answer
17 views

How can I tell if a CHECKBOX contains focus.  We have a specific set of keyboard requirements that if the user clicks the "ENTER" key, the next control should bet set focused, but not change the state of the checkbox.  Clicking the "ENTER" key does change the state.   When you are on a CheckBox, ContainsFocus doesn't seem to work.   So, what we would like to do, is if the CHECKBOX has focus, when the use clicks the "ENTER" key, it just moves to the next control in a tab order and not check the checkbox.  (We are trying to get the DateTimePicker to do the same thing)...

 


protected virtual void HandleKeyDownForForm(object sender, KeyEventArgs e)
{
   if (e.KeyData == Keys.Enter)
   {
      if (ntsRadDateTimePickerDob.ContainsFocus)
      {
         _dobHasNullValue = !ntsRadDateTimePickerDob.NullableValue.HasValue;
      }

      if (radCheckBoxActiveAbsentee.ContainsFocus)
      {
         _activeAbsenteeValue = radCheckBoxActiveAbsentee.IsChecked;
      }

      Control ctl = (Control)sender;
      ctl.SelectNextControl(ActiveControl, true, true, true, true);
   }
}

 

Any help would be greatly appreciated.

 

Thank You.

Nadya | Tech Support Engineer
Telerik team
 answered on 01 Apr 2024
1 answer
14 views

I would have thought that after selecting some rows in a RadListControl and hitting Ctrl-C it would copy the text from those rows, but no - it doesn't copy anything.  I also would have thought that there'd be a standard context menu if I were to right-click on it, but not that either.

Am I missing something, or is this the standard behavior of this control?  If it is, do you have some other listbox control that behaves the way I would expect?

Nadya | Tech Support Engineer
Telerik team
 answered on 29 Mar 2024
1 answer
12 views

 

Hello,

I've created a custom cell in a radgridview so that I can in one column either display a RadDropDownListElement or a RadTextBoxControlElement depending on if the tag of the row has a datatable or not. If it has a datatable it will show the dropdown, otherwise it shows the textbox.

This I've done pretty much according to this tutorial.

https://docs.telerik.com/devtools/winforms/controls/gridview/cells/creating-custom-cells#custom-group-cell-example

 

However, my problem is that the selected index changed event on the dropdown is triggered too early, i.e. before all data has been loaded. Is there a way to get around this? I would like that the selected index changed event only kicked in if all the data of the form has been loaded. This I usually achieve by checking if a flag, e.g. 'IsInitiated', is true in the  beginning of the Sub. But cannot seem to reach such a flag from the custom cell class.

 

Nadya | Tech Support Engineer
Telerik team
 answered on 28 Mar 2024
1 answer
13 views

For some reason, I can't reduce the width of this RadForm in the designer or programaticaly.  The controls are an autosized RadButton on an autosized FlowLayoutPanel on an autosized RadForm.

Margins and Padding are set to 0 for everything.  What am I doing wrong?

 

What

Dinko | Tech Support Engineer
Telerik team
 answered on 26 Mar 2024
5 answers
34 views

Hello,

I would like to ask for help with designing parameter editor with subitems. I have editor of test items, each item has some parameters and tolerances (Min, Max). Standard tests have just main tolerances, but some tests have also subitems. More precisely, if test has subitems, only subitems have tolerances, main tolerances are not used. Columns for items and subitems are almost the same, items have parameters and subitems don't have any parameters, but there is just a name of subitem instead of test type of parent item. So first attempt of editor looks like this:

One small question to this solution, how can I show "+" only if there are some subitems?

But I am not satisfied with that design, subitems have own border, own column headers, it's little bit confusing and not very clear. I know it's standard way of master-detail views, but in this case, I would prefer design similar to self referencing hierarchy, because columns are almost the same, just some cells are empty and I have name of subitem name instead of test type.

I have made a second test with selfrefencing and changed the screenshot a little bit to show you what I am trying to achieve. Is it possible to have view similar to this?

I think I can do it with some modified data structures specialized for editor, I can use nullable properties for tolerances and parameters to hide certain cells, handle some events to have those empty cells readonly, maybe it would be tricky to show indented subitem name in test type combo box column, but I think this solution would be a little bit ugly. Is there any better way to do this?

I have attached my test project for tests.

Nadya | Tech Support Engineer
Telerik team
 answered on 26 Mar 2024
2 answers
21 views

Hi!

When using CopyingCellClipboardContent the event is fired x3 times in each cell (once for each supported format). So if I have selected 5 cells the copy will trigger the event 15 times. Is there any kind of event for multiple copies?

Nadya | Tech Support Engineer
Telerik team
 answered on 26 Mar 2024
1 answer
17 views

Hi,

My team is trying to make an update from WinForms 2015.1.331 to the Latest 2024 Q1 Update 2024.1.130. Asked me for the comparison RadGridView component features until 2015 Q1 version(current) vs the rest of improvements/features from current to 2024 Q1 version. Is there a better way to get this comparision without scrolling through all releases and noting down the features and manually analyzing?

Nadya | Tech Support Engineer
Telerik team
 answered on 25 Mar 2024
9 answers
454 views

I doubt that this is an issue with the WinForms controls but I'll ask anyway in case anyone has experienced this problem (and I haven't found any solution searching the web).  My project is MDI with seven child forms so far.  After a few months of development I finally experienced a problem when I select several of my menu options (launch several child forms).  It doesn't matter what the order I select the menu options; the third menu option, whichever option that happens to be, gets a System.NullReferenceException.

The code for each menu option is this pattern:

private void miDULAudit_Click(object sender, EventArgs e)
{
    if (objDULAudit == null)
    {
        objDULAudit = new frmDULAudit();
        objDULAudit.MdiParent = this;
        objDULAudit.FormHiding += new EventHandler(ChildFormHiding);
    }
    objDULAudit.Show();
    objDULAudit.BringToFront();
    objDULAudit.Activate();
    objDULAudit.WindowState = FormWindowState.Maximized;
}

 

The error happens at objDULAudit.Show(); (in this code example).  

System.NullReferenceException was unhandled
  HResult=-2147467261
  Message=Object reference not set to an instance of an object.
  Source=System.Windows.Forms
  StackTrace:
       at System.Windows.Forms.NativeWindow.WindowClass.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
  InnerException: 

 

I stepped through every line of code (as the child form instantiates) trying to run into the problem but I have not been successful.

Any ideas?

Thank you,

Gary

 

 

Nadya | Tech Support Engineer
Telerik team
 answered on 21 Mar 2024
1 answer
24 views
Hello,

I have a RadTreeView control and a RadDock control together in a WinForms app. The user needs to be able to drag a node from the RadTreeView to either the DocumentTabStrip part of RadDock or the control thats in a DocumentWindow. How do I tell which part of the RadDock the node is being dropped on? Im currently using the  TreeViewElement.DragDropService to handle the PreviewDragDrop method but the RadDropEventArgs.HitTarget gives me a RadPageViewStripElement regardless of where i drop the node. If I am dropping in the content area of the a document window (floating or docked) how do i get the actual DocumentWindow object itself?

Let me know if more information is required.

Thanks,

Hayley
Dinko | Tech Support Engineer
Telerik team
 answered on 21 Mar 2024
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