Delphi tips (How to solve the problem)

How to Solve a problem,[dcc32 Error] Unit1.pas(46): E2003 Undeclared identifier: 'TPageIndex'.

When I try to write a program with new component like PDFtoolkit VCL After design form by drop a
component to Delphi form and try to compile for test it
. I found an error like this
“[dcc32 Error] Unit1.pas(46): E2003 Undeclared identifier: 'TPageIndex'
I know this error solve by add uses unit on interface section
. But I dont know a unit name to solve it.
This is my solution. Download PDF
(This is first blog with English language)

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