Based on a Code-Snippet found at StackOveflow I implemented a warning-message that will be displayed if the user tries to leave the page without saving his changes made on the form.

This article describes a method on how to implement dynamic quickpicks for form elements in Oracles Application Express.

This example shows how to implement a matrix of toggleble values in an interactive report in Apex. 

After reading this great article about background-processes I got an simple idea on using charts as progress-bar instead of the mentioned PCT_GRAPH format.