[RESOLVED] Strange One - Comboboxes highlight when TableLayoutPanel is Dock = Fill

[squatman]

Hi,

I've used this arrangement in other projects and not had this problem.

I have a TableLayoutPanel within a Panel, the TableLayoutPanel has multiple rows containing ComboBoxes, TextBoxes and DateTimePickers.

If the TableLayoutPanel is Anchored Top/Left I have no issues, when I set the TableLayoutPanel Anchor to Top/Left/Right or Dock = Fill when I run my application each ComboBoxes value is highlighted.

I've ensured the containing panel isn't being selected (but why would it only happen when docked?)

I've tried setting the ComboBox.SelectionLength = 0, and .SelectionStart = Text.Length didn't work but would like a better solution anyway.

If anyone has any suggestions it would be greatly appreciated, thank you.

Thank you.

[.paul.]

To deselect any items in your ComboBox... - ComboBox.SelectedIndex = -1

[jmcilhinney]

Please provide a specific set of steps that we can follow to reproduce the issue.

[squatman]

Paul, thanks for the response. I need an item in the drop down selected, just not highlighted/focused. I'll explain further now and hopefully give you what you need also jmc.

I have a form with a TableLayoutPanel filling it, 3 main columns, in the right hand column, I have another TableLayoutPanel with multiple rows, in the bottom row I have a CustomPanel (see below) and within that Panel I have the TableLayoutPanel in question.

CustomPanel:

Public Class CustomPanel
    Inherits System.Windows.Forms.Panel
 
    Protected Overrides Function ScrollToControl(ByVal activeControl As System.Windows.Forms.Control) As System.Drawing.Point
        Return Me.AutoScrollPosition
    End Function
End Class

I have a DataGridView in the middle column on my first TableLayoutPanel, A button can be clicked to make the right hand column appear (setting width to 350 instead of 0), in this column within the final TableLayoutPanel I have my controls that display the data from the selected row in the D

Please see the collection of screenshots showing the layout and the issue.









Thank you.

[squatman]

Hi there,

I've just come back to this now and have found that if the form is big enough so that the autoscroll bar hasn't kicked in, as soon as I resize the form to the point that the auto scroll bar appears, at this point the ComboBoxes suddenly highlight.

As before if I change (for testing) one of the ComboBoxes Dock from Fill to None, that ComboBox doesn't get highlighted.

Not sure if that sparks any ideas, but I thought I'd post.

Thank you.

[squatman]

Ok,

So this led me to search differently for the problem, the problem being ComboBox resize.

The following solved my issue:

Private Sub MyControl_Resize(sender As Object, e As EventArgs) Handles Me.Resize
 
    MyComboBox.SelectionLength = 0
 
End Sub

Taken from the following sites:

https://stackoverflow.com/questions/...-automatically

https://social.msdn.microsoft.com/Fo...orum=vbgeneral

Thank you to everyone who took time to read and/or look into this one.