@Lalit_Singh  

As per Pega product design, whenever a reload / cancel action in the section is triggered in the flow execution due to any actions at runtime, the dirty state is set and the "Discard changes" pop-up appears.

If you want the dirty state popup (Discard changes) to be appear on screen, try the below code,

<script>

pega.u.d.gDirtyOverride = true;

</script>

If the changes are to be reflected in a particular section (locally), 

• Create a non auto generated section, include the code in the HTML tab of the section. Include the above section in the other section where the changes are to be reflected. 

If the changes are to be reflected across the application,

• Add the above code in the UserWorkForm.

If you don't want the dirty state popup (Discard changes) to be appeared on screen, set the above mentioned flag to 'false' and perform the above steps wherever needed.

<script> pega.u.d.gDirtyOverride=false; </script>

Hope this helps! Thanks Chandan U