Dynamic Initialization of Widget in GridPanel does not appear in Hierarchy Editor

Hi, I follow I tutorial I found online on making widgets in C++. I wanted to create a widget that has a grid that dynamically puts a widget based on Columns and Rows that the User will specify but Upon Initializing those dynamic widgets in grids, I Initialize it on the SynchronizeProperties() function. It does not seem to appear in the hierarchy. It would much be cooler if the designer can put changes inside that widget blueprint and modify each element.

I only used the Grid->AddChildToUniformGrid(DynamicWidgetSlot). Is there any function I should call in order for it to appear in the hierarchy?