I have just downloaded example and have no issues changing lblTitle properties both in the Designer Layout "Item" and in code.
B4X:
Sub CreateItem(clr As Int, Title As String, id As ItemData) As B4XView
Dim p As B4XView = xui.CreatePanel("")
p.SetLayoutAnimated(0, 0, 0, clv1.AsView.Width, id.ExpandedHeight)
p.LoadLayout("Item")
p.SetLayoutAnimated(0, 0, 0, p.Width,id.CollapsedHeight)
lblTitle.SetTextAlignment("CENTER", "RIGHT")
lblTitle.TextSize = 26
lblTitle.Text = Title
'............................
How bizarre. I can't get it to change at all. I even added another label to the title and it doesn't show - it resolutely stays stuck to the values of the initial example.
Ok, I downloaded it again - to a different destination and unzipped it to a different destination and it worked. I think it was mixed up with another project.