I am having trouble figuring out how to show visual components created programmatically. I seem to be able to, for example, do this:

An integer, i, is declared in the public section.

    with TEdit.Create(Form1) do begin
        Visible:=True;
`      Enabled:=True;
        Name:='TestEdit"+IntToStr(i);
        Show;    //tried this in desperation but no success.
        Form1.Refresh    //this did not produce a visible new component
either.
    end;

The edit box seems to be created as Form1.ComponentCount increases and the Name generated is shown in another edit box.

My problem is that I cannot get the new edit box to be visible (I even had code to ensure that .Top and .Left were such that the new component would be located within the Form1 coordinates. Can anyone tell me what I am doing wrong.

Thanks in advance.

Best regards,
Dennis

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What about adding position of left and top and also Form1 as parent ?

with TEdit.Create(Form1) do begin
        Visible:=True;
        Enabled:=True;
        Name:='TestEdit"+IntToStr(i);
        ///////////////////////////////
        Left := 50;
        top := 100;
        Parent := Form1;
        ////////////////////////////////
        Show;    //tried this in desperation but no success.
        Form1.Refresh    //this did not produce a visible new component
either.
    end;

http://ik.homelinux.org/

2010/1/15 Dennis M. Linton

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You have to set the parent of the component before you will be able to see it.
SetParent(Form1)
or Parent:=Form1 should do.

2010/1/15 Dennis M. Linton

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Thanks, IK and also to Andew Brunner who also replied.

For some reason, I was thinking that the TEdit.Create(Form1) established Form1 as parent. Anyhow, I set the parent and life is good again. Many thanks.

Best regards,
Dennis

For some reason, I was thinking that the TEdit.Create(Form1) established Form1 as parent.

It sets Owner which deals with memory management.
Parent is the visual container.

Regards,
Juha Manninen