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IDProjectCategoryView StatusLast Update
0038126LazarusLCLpublic2020-12-01 23:58
ReporterGalderius Assigned ToBart Broersma  
Status resolvedResolutionfixed 
Product Version2.1 (SVN) 
Summary0038126: TComboBox always have BorderStyle bsSingle.
DescriptionBorderStyle of TComboBox can't be changed.
Steps To Reproduce>Put a TComboBox in a form
>BorderStyle is set to bsNone by default when bsSingle should be the default one
>TComboBox remain his border
>Change the property has no effect, border is always on
TagsNo tags attached.
Fixed in Revisionr64169
Attached Files


Bart Broersma

2020-11-24 22:22

developer   ~0127163

Can you change BorderStyle of a TComboBox in Delphi (recent version)?


2020-11-24 23:44

reporter   ~0127164

Yes, I can, using these options: BevelInner, BevelOuter and BevelKind.
TComboBox Delphi.jpg (324,038 bytes)

Bart Broersma

2020-11-24 23:47

developer   ~0127165

Last edited: 2020-11-24 23:50

View 2 revisions

That wasn't the question.
Does Delphi have a Borderstyle property that you can set for a TComboBox (and to which values)?
Delphi 7 doesn't have it.


2020-11-25 00:17

developer   ~0127166

> Delphi 7 doesn't have it.

And Delphi XE 10.3.3 either.


2020-11-25 01:32

reporter   ~0127168

"Does Delphi have a Borderstyle property that you can set for a TComboBox?"
Yes, it has.

"and to which values?"
BevelInner, BevelOuter and BevelKind. See the screenshot above.

"Delphi 7 doesn't have it."
Delphi 7 is from 2002, the year of Windows XP. It's about 20 years ago.
Delphi XE 10.3 probably has it too in these properties.

Bart Broersma

2020-11-27 14:48

developer   ~0127208

For the last time:

The property you refer to in Delphi is called BevelEdges.
AFAICS form the attached screenshot from your Delphi, there is no property called BorderStyle
A borderstyle property would have values like bsIngle, bsNormal, bsNone etc. like you described in the "Steps To Reproduce".

So, Delphi does not have this property, at least not published.
Since I don't have a recent Delphi, I cannot check wether code like "Combobox1.BorderStyle := bsNone" would even compile in Delphi.

jamie philbrook

2020-11-27 16:04

reporter   ~0127211

I don't see a Borderstyle property in Delphi 10.3

but there was a thread running in the forums about a borderless combobox for which I show a little code in how to do it but its only a windows piece of code..
I would suggest to go there and search the threads or start a new one on it, maybe.

Bart Broersma

2020-11-28 17:01

developer   ~0127242

Delphi (10) does not have a Borderstyle property for TCombobox as it turns out.

Bart Broersma

2020-11-28 17:41

developer   ~0127245

Setting Params.Flag(Ex) in TWin32WSCustomComboBox.CreateHandle like this (if BorderStyle = bsNone) has no effect

    Params.Flags := Params.Flags and not WS_BORDER;
    Params.FlagsEx := Params.FlagsEx and not WS_EX_CLIENTEDGE;

Looks like Windows doesn't support this at all?

Bart Broersma

2020-12-01 22:57

developer   ~0127310

On Windows it is not possible to remove the border by simply setting BorderStyle to bsNone.
You can sublass TComboBox and override Paint to achieve this if you really need it (example code can be found using Google).
I have documented this behaviour as being restricted for the Windows widgetset.
(You can see this in the "Restricted" tab of the ObjectInspector).

The reason we have this property is that some other widgetsets actually support this.

Please close.

Issue History

Date Modified Username Field Change
2020-11-24 21:08 Galderius New Issue
2020-11-24 22:22 Bart Broersma Note Added: 0127163
2020-11-24 23:44 Galderius Note Added: 0127164
2020-11-24 23:44 Galderius File Added: TComboBox Delphi.jpg
2020-11-24 23:47 Bart Broersma Note Added: 0127165
2020-11-24 23:50 Bart Broersma Note Edited: 0127165 View Revisions
2020-11-25 00:17 wp Note Added: 0127166
2020-11-25 01:32 Galderius Note Added: 0127168
2020-11-27 14:48 Bart Broersma Status new => feedback
2020-11-27 14:48 Bart Broersma LazTarget => -
2020-11-27 14:48 Bart Broersma Note Added: 0127208
2020-11-27 16:04 jamie philbrook Note Added: 0127211
2020-11-28 04:37 Galderius Note View State: 0127164: private
2020-11-28 04:37 Galderius Note View State: 0127164: public
2020-11-28 17:01 Bart Broersma Note Added: 0127242
2020-11-28 17:41 Bart Broersma Note Added: 0127245
2020-12-01 22:57 Bart Broersma Assigned To => Bart Broersma
2020-12-01 22:57 Bart Broersma Status feedback => resolved
2020-12-01 22:57 Bart Broersma Resolution open => fixed
2020-12-01 22:57 Bart Broersma Fixed in Revision => r64169
2020-12-01 22:57 Bart Broersma Widgetset Win32/Win64 => Win32/Win64
2020-12-01 22:57 Bart Broersma Note Added: 0127310