Reaction to moving the mouse outside the component while the mouse is pressed

[sibedir]

If I place a ScrollBox on the form, then when you press and hold the mouse button within the boundaries of the ScrollBox, the ScrollBox continues to respond to mouse movement outside the boundaries of the ScrollBox in the same way.
But if I dynamically create

Code: Pascal  [Select][+][-]

1. MyControl := TMyWinControl.Create(Form1);
2. MyControl.OnMouseMove := @ScrollBox1MouseMove;

my component

Code: Pascal  [Select][+][-]

1.   TMyWinControl = class(TScrollingWinControl)
2.   published
3.     property OnMouseMove;
4.   end;

on the form, then the effect disappears.

Can you please tell me what ensures the response to mouse movement outside the component boundary?

P.S.: Sorry for my English

[Thaddy]

OnMouseEnter OnMouseLeave.

[sibedir]

But I didn't assign OnMouseEnter and OnMouseLeave handlers to ScrollBox. At the same time, OnMouseMove for ScrollBox also works abroad.

[sibedir]

Oh, looks like I figured it out.
When creating control need to do

Code: Pascal  [Select][+][-]

1. MyControl.ControlStyle := ControlStyle + [csCaptureMouse];

[jamie]

before you get to far,  you may want to look at TCustomControl as the base

[sibedir]

before you get to far,  you may want to look at TCustomControl as the base

I got you. I’ll read about TCustomControl. Thanks for the advice.
For now I'm just experimenting. But if I’m going to make my own component, then you’re right. It is better to immediately follow the general rules for compatibility and not to step on long-known rakes.