Painting rectangular box, whenever the left mouse button press, move the mouse, draw a rectangular, when the mouse to loosen, the rectangular box disappear, similar to the selected function

juxing
......\Project2.bpr
......\Project2.cpp
......\Project2.exe
......\Project2.obj
......\Project2.res
......\Project2.tds
......\Project2.~bpr
......\Unit1.cpp
......\Unit1.ddp
......\Unit1.dfm
......\Unit1.h
......\Unit1.obj
......\Unit1.~cpp
......\Unit1.~ddp
......\Unit1.~dfm
......\Unit1.~h

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