I decided to make an application that like statechart simulation tool or flowchart (such as yEd, MS visio etc.). It will be a diagram scene application. But, I have'nt decided to platform that I will use yet. Which one is suitable for this jobs?
well, I have only WPF platform experience but I'll share my experience in those area. I worked almost 2 years for developing in desktop application using WPF(I know it was 1~3 millions $ project). and some portion of my job is developing and maintaining diagram based canvas with telerik libraries.
but the first, I want to recommend you to choose your program going to be a .net-based/cross-platform/web-based.
If you choose that you are going to make windows application and those diagram chart, then WPF and telerik may be a one of good choices.