@mr-dang wrote: For more reading on dialogs, please see these resources:https://powerapps.microsoft.com/en-us/blog/creating-dialogs-in-powerapps/https://powerusers.microsoft.com/t5/PowerApps-Community-Blog/How-to-build-a-Message-Box/ba-p/30624https://www.youtube.com/watch?v=_Dc0wJx9EN0https://www.youtube.com/watch?v=3R3BQ5P8X5U
For more reading on dialogs, please see these resources:
You can use the links above for instructions on how to make a pop-up dialog message.
The easier way to solve your problem would be to disable the submit button.
Button.DisplayMode:If(IsEmpty(ComboBox1.SelectedItems) || IsEmpty(ComboBox2.SelectedItems),
"Please select a choice from each ComboBox.",
"Submit this form"
I attached a zip containing the app file that has this behavior.
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