From Xojo Documentation

Property (As Integer )
aWebUIControl.TabIndex = newIntegerValue
IntegerValue = aWebUIControl.TabIndex

New in 2020r1

Supported for all project types and targets.

The WebUIControl's control's position in the Tab Order. The control with a TabIndex of 0 is the first WebUIControl to get the focus when the page opens in the browser.

Sample Code

This example sets the control's TabIndex.

Me.TabIndex = 2