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New in 2021r3
Used to organize controls into groups of tabs that can be selected by the user. Only the controls on the selected tab are visible.
Getting and Setting the displayed Panel
Use the Value property to get and set the tab panel being displayed. Also, the PanelCount property of the DesktopPagePanel gives you the number of panels in the DesktopTabPanel. The DesktopTabPanel control is subclassed from DesktopPagePanel; the Value and PanelCount properties are described there.
You get or set the panel on which a control is located via the PanelIndex property of the DesktopControl class. The first panel is numbered zero.
The following line of code moves a ListBox from its current panel to the second panel of a DesktopPagePanel.
Adding, Labelling, and Renaming Tabs
Click the value of the Panels property of the DesktopTabPanel to display the Tab Panel editor. From this screen, you can:
- Rename the existing tab labels by clicking twice on its name and editing the name.
- Add tabs and their labels by clicking the Add button.
- Delete any tab by highlighting it and clicking Delete.
- Rearrange the tabs by highlighting a tab and clicking the Up or Down buttons.
You add controls to a particular panel by clicking its tab and dragging controls to that panel.
Placing Controls on Tab Panels
You can place other controls on the surface of any tab panel. Such controls are visible only when the user clicks on that panel's tab to bring it to the front. You can use the PanelIndex property of the DesktopControl class to read the panel on which the control is located.
Placing TabPanels within PagePanels (and vice versa) are not supported.
If the CaptionAt property contains an ampersand character, it will display only if it is preceded by another ampersand character. This is done to make applications on all platforms behave consistently. The ampersand character is used to indicate the keyboard accelerator on Windows.
Controls placed on TabPanels are referenced in your code just by using the control name as if it were not on a TabPanel:
PushButton1.Caption = "OK"
The DesktopTabPanel does not track the controls within it. You can retrieve an array of controls that are attached to a given index like this:
Var tbControls() As DesktopUIControl
Var wnd As DesktopWindow = panel.Window
Var lastIndex As Integer = wnd.ControlCount - 1
For i As Integer = 0 To lastIndex
Var c As DesktopUIControl = wnd.Control(i)
If c IsA DesktopUIControl Then
Var rControl As DesktopUIControl = DesktopUIControl(c)
If rControl.Parent = panel And rControl.PanelIndex = panelIndex Then