Simple Xojo Youtube tutorial app behaves differently

Getting Started
1

I am completely new to Xojo (but definitely not to programming!). I figured I would start out slow and follow Paul’s “Creating a Desktop Application With Xojo” tutorial on youtube. (https://www.youtube.com/watch?v=rBgURfg11qo)

At 29:02 into the video Paul clicks on the “complete” checkbox for the first row of the ListBox and a red line is drawn through the contents of the second cell in that row. Seems like very intuitive and expected behavior. However, I tried to duplicate the entire application in 2015r1 and when I click on the checkbox I get nothing. But, if I click on the “TASK” header then the row gets the red line. If I unclick the checkbox the red line stays. Click on the “TASK” header again and the red line disappears.

Do I need to do something special to get the ListBox to update?

Thanks!

2

It seems like some optimizations to ListBox since the first Xojo release might be preventing the refresh from occurring when the checkbox is clicked. You can refresh it yourself by adding a CellAction event handler to the ListBox and putting this code in it:

Me.Refresh(False)
3

Paul - tried that, but no joy.

4

Hmm. Well, here’s a quick example I threw together for you to try:

ToDoDesktop

5

Paul – I tried your example and it misbehaves in the same fashion. I add an entry and then mark it as complete. It does not get the red line until I click the TASK column header.

6

Sorry, my quick code works on OS X, but not Windows. This line of code in the CellAction event handler works on both:

Me.InvalidateCell(row, 1)
7

Paul – that was the ticket! Works like I expect now. Thanks. And thanks for the tutorial too!