RAD Studio VCL Reference
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Messages.TWMLButtonDown Type

TWMLButtonDown represents the Windows message that occurs when the user clicks the left mouse button.

Pascal
TWMLButtonDown = TWMMouse;
C++
TWMMouse TWMLButtonDown;

TWMLButtonDown is the data structure that CLX uses for Windows messages informing an application that the user just clicked the left mouse button. It is the same as all mouse messages. 

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