GeoMedia Terrain's Unintuitive Terrain Models Dialog Box

The first time I launched the Terrain Models command, I was dumbfounded for a while. Quite a while. I was supposed to build a terrain model using this dialog but there are no obvious indicators to guide me along. The layout and visual arrangement of the buttons, list boxes and labels do not tell me which item I should click on first.

How was I to know that you have to select a Geomorphic data store or a grid data store label and drag the item and drop it on one of the labels: Grid Terrain model or TIN terrain model? Only after reading the online document Working with GeoMedia Terrain that I learn about how to do it. Intergraph need to redesign this dialog box for better user interaction.