Acces to listbox in Panelbar

[Declan]

I am using the following code to build a PanelBar from a database table. For each "FileType" I add a panel and place a ListBox in the panel. This works just fine.

For Each itemFileTypes In collFileTypes

If itemFileTypes.IsInUse Then

Dim newGroupElement As New RadPanelBarGroupElement

newGroupElement.EnableHostControlMode = True

newGroupElement.Caption = itemFileTypes.Descr

Dim lst As New RadListBox

lst.Name = itemFileTypes.Descr

lst.Dock = DockStyle.Fill

lst.Text = itemFileTypes.Type

newGroupElement.ContentPanel.Controls.Add(lst)

radPanelBar.Items.Add(newGroupElement)

End If

Next

radPanelBar.Dock = DockStyle.Left

radPanelBar.ThemeName = "ControlDefault"

' Set focus to Log panel

radPanelBar.Items("Log").Focus()  ' This throws exception

Later in my code I need to access the ListBox to assign its DataSource and load the appropriate data into each ListBox.

' For each panel find the listbox and assign its DataSource etc

' add a listbox event handler for SelectedValueChanged.

Try

Dim pnl As RadPanelBarGroupElement

For Each pnl In radPanelBar.Items

Dim lst As RadListBox

'newGroupElement.ContentPanel.Controls.Add(lst)

' This is where I come unstuck!

lst = pnl.Items(0)  or  pnl.ContentPanel.Controls(0) ???

With lst

.ValueMember = "id"

.DisplayMember = "FileDescription"

.DataSource = GetFileNamesByType(CType(lst.Text, Integer))

'.EmptyRows = True

AddHandler lst.SelectedValueChanged, AddressOf ListBoxSelectedValueChanged

End With

Next

See where I come unstuck above. What am I missing?

'newGroupElement.ContentPanel.Controls.Add(lst)

If I added a listbox to the controls collection of the ContentPanel of the GroupItemElement, why can I not access the ContentPanel of the GroupElement?

e.g.

lst = GroupElement.ContentPanel.Controls(0)

Declan

[Mike]

Hello Declan,

The proper way to access the listbox control would be:

pnl.ContentPanel.Controls(0)

However, there is a known issue, related to ListBox, when it is data-bound in PanelBar if the PanelBar is in OtlookNavPane mode. In this case, the panel bar adds the child ContentPanel controls to its child Controls collection only when the corresponding item (PanelBarGroupElement) is selected. Then, RadListBox would not behave correctly and will not create its items, despite that its datasource is assigned. The solution to this problem would be to assign BindingContext of the Form to the ListBox before setting the DataSource:

lst.BindingContext = Me.BindingContext
lst.DataSource = ...

Let me know if you need assistance any further.

Best wishes,
Mike
the Telerik team

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[Declan]

Hi Mike,

Yes, thanks. That works a treat.

One final question on this:  How can I switch panels in code? After adding panels it is the last added that remains selected. I want to select the first panel. 

radPanelBar.Items(0).Select    or something like this?

Regards,
Declan

[Mike]

Hello Declan ,

There is a Selected property on RadPanelBarGroupElement, however, you should cast the item to the corresponding type:

(DirectCast(radPanelBar1.Items(0), RadPanelBarGroupElement)).Selected = True

Or
(DirectCast(radPanelBar1.Items("Log"), RadPanelBarGroupElement)).Selected = True


Regards,
Mike
the Telerik team

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