How can Virtual Treeview control be made to always scroll by lines?

You could intercept the TBaseVirtualTree. OnScroll event and use the virtual treeview's canvas's return value for textheight('M') as the amount to change TBaseVirtualTree. Offsety in order to increment (scroll up) or decrement (scroll down).

Could also test to ensure that pre-scroll position modulus textheight('M') is zero (to avoid scrolling by the right amount from the wrong position).

This is what I came up with the help of Argalatyr, looks like it does what I want it to.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.