Merge pull request #16 from alxnek/master

GOOD
Fixing select customer combobox reload bug
delete methods in GUI
delete working
Merge pull request #17 from alxnek/DevelopmentAlex

Updating my master
Merge pull request #21 from motherdear/master

gui update
Merge branch 'DevelopmentAlex' of https://github.com/alxnek/CSharp_CarDealer into DevelopmentAlex

Conflicts:
	CarDealer_GUI/MainWindow.xaml.cs
gui working