For comparison the best UI building experience I ever has was with Motif. There was a high degree of orthogonality, each dialog box could have Rows or Columns,

For comparison the best UI building experience I ever has was with Motif. There was a high degree of orthogonality, each dialog box could have Rows or Columns, and those could both contain either Rows or Columns. You go down the tree until you have your foundation elements, buttons and the like. It was so easy. And after that it was just filling in the callback functions for the events.