Dynamically showing a button when checkbox checked

Problem

I tried a number of solutions online. A lot of them were quite complicated and involved changing the button classes. This was not necessary in my case.

Solution

Create you checkbox and your button as normal.
Checkbox Values:
STATIC:Yes;Y

Button condition

Create 4 dynamic actions: 

 #1 at region level to default the checkbox value.
 #2 at region level to hide the button.

These are the settings of the dynamic action.

#1 Default the value (set to null)

#2 Hide the button.

   #3 at the checkbox level to show the button when the checbox is changed.
   #4  at the checkbox level to refresh the region.

These are the settings of the dynamic action

 #3 Show the button

#4 Refresh the region

There's probably a more elegant way of doing this, but it worked for me when a lot of advice on forums did not.