java - JDialog appears in the top left corner of screen, when when I've set it's position to the center of its parent -


before initialized dialog 

  addquestiondialog = new jdialog(swingutilities.windowforcomponent(this),"add    question);

and set location of dialog @ center of parent calling:

addquestiondialog.setlocationrelativeto(this)

this works , displays dialog @ center of parent, when set dialog modal dialog, ignores set method , displays dialog in top left corner of screen.

addquestiondialog = new jdialog(swingutilities.windowforcomponent(this),"add question", dialog.modalitytype.document_modal);

however when set dialog modal dialog, ignores set method , displays dialog in top left corner of screen.

the order of code should be:

dialog.setlocationrelativeto(..); dialog.setvisible(true );

i'm guessing using:

dialog.setvisible(true ); dialog.setlocationrelativeto(..); // not executed until dialog closed.

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