Align ButtonField Center in HorizontalFieldManger when ObjectChoceField is not selected

Hello
I have developed a screen in which there's a topic labelField below that there is an ObjectChoiceField... My position and ObjectChoiceField do not scroll and will remain constant, under the title and ChoiceField object I have some data that must be the subject of a scroll and I could achieve this scrolling thing but my problem is that I place a button below these materials and placed this button in HorizontalFieldManager as follows

ButtonField back;
HorizontalFieldManager But_Back = new HorizontalFieldManager (HorizontalFieldManager.FIELD_HCENTER);
Back = new CustomButtonField ("Back", ButtonField.FIELD_HCENTER);
Back.setChangeListener (this);
But_Back.Add (back);

The first problem: At when only the header of the loading of the page and object coice field and my left side coded hard LabelField will be present and the button below and when I select the value in the ObjectChoiceField then the values corresponding to the labelField letside will be displayed all I can attchieve using the fieldChanged but my button that is currently I am unable to put in the Center... that when the page is loaded without values are present, so the button is to the left side and when I select a value of ObjectChoiceField, then it is aligned to the Center, I want to be at the Center...
FYI: in the order of scroll implememtn in my Constructori say

Super (new VerticalFieldManager (), NO_VERTICAL_SCROLL);
Here I put the code for coice position and object fields in two different HorizontalFieldManager and then announces to the screen
             
For the scrolling now, I create a verticalFieldManger like:
VerticalFieldManager vor = new VerticalFieldManager(VerticalFieldManager.VERTICAL_SCROLL |) VerticalFieldManager.VERTICAL_SCROLLBAR);
and each variable left and right in addition to HorozontalFieldmanger
HFM HorizontalFieldManager = new HorizontalFieldManager();
VFM. Add (HFM);

and at the end I say
HorizontalFieldManager But_Back = new HorizontalFieldManager (HorizontalFieldManager.FIELD_HCENTER);
Back = new CustomButtonField ("Back", ButtonField.FIELD_HCENTER);
Back.setChangeListener (this);
But_Back.Add (back);
VFM. Add (But_Back);
Add (VFM);

Add Field.USE_ALL_WIDTH in your VerticalFieldManager and DrawStyle.HCENTER in your ButtonField.

Something like:

VerticalFieldManager vfm = new VerticalFieldManager(Field.USE_ALL_WIDTH | VerticalFieldManager.VERTICAL_SCROLL | VerticalFieldManager.VERTICAL_SCROLLBAR);
///
///
HorizontalFieldManager But_Back = new HorizontalFieldManager(HorizontalFieldManager.FIELD_HCENTER);
ButtonField  Back = new ButtonField("Back",DrawStyle.HCENTER);
Back.setChangeListener(this);
But_Back.add(Back);
vfm.add(But_Back);
add(vfm);

Concerning

Bika

Tags: BlackBerry Developers

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