How can I remove the Default selection in Listbox GUI?

I always see the top option in the listbox is default selected. How to remove this default selection?

Please help me. I checked the property inspector but couldn't find any solution. Thanks!

Answer 1

[Adam Danz]

If you'd rather have the 2nd one as default set the 'Value' property to 2.

If you want there to be no default, set the 'Value' property to an empty matrix and set the 'Max' and 'Min' properties to satisfy the following condition:

 Max - Min > 1

Note that this will also allow the user to select >1 from the listbox. More info .

[Vinayak Appasaheb Bhatte]

Thanks adam! I get a warning when I set the value property to 0x0 array. Is that fine?

[Adam Danz]

What does the warning say? When do you get the warning - when you open the GUI? I just tried it on one of my GUIs and it worked fine.

[Vinayak Appasaheb Bhatte]

Warning: Multiple-selection 'listbox' control requires that 'Value' be an integer within Character vector range Control will not be rendered until all of its parameter values are valid.

I put the size of the matrix as 0x0 in value property. Default size was 1x1

[Image Analyst]

Like it says, the value property of the listbox cannot be 0. It must be between 1 and the number of items in the listbox.

[Vinayak Appasaheb Bhatte]

Alright, Thank you so much for the help!

[Adam Danz]

Set value with an empty matrix like this.

 'Value',[]

[Adam Danz]

For example

figure
uicontrol('style', 'listbox', ...
    'string', {'a' 'b' 'c'}, ...
    'value', [], 'min', 1, 'max', 10, ...
    'units', 'normalize', ...
    'position', [.5 .5 .1 .3])

[Vinayak Appasaheb Bhatte]

I have set the callback function directly by placing the listbox in gui. I don't think so I set value as [] inside by callback function.

[Adam Danz]

You need to set that value either 1) when you are creating the listbox (as in my example) or 2) in the properties menu if you're using GUIDE.

You can also change the 'value' setting any time by using the handle to the listbox.

either

lb.Value = []; 
or 

set(lb, 'Value', [])

[Vinayak Appasaheb Bhatte]

Thanks Adam :)