اعملت فورم لشاشه دخول ولما اعمل run للفورم لا تعمل الbuttons  الموجوده في الفورم ....لماذا ؟....
صوره الكود لكبسه الدخول موجود بالمرفقات 

Property palrt of the button
mouse navigation ..no

thaaaaaaaaaaaaaaaaaaanks ya marwan
بس هاي شو شغلها بالزبط ؟؟؟؟؟(mouse navigation)

السلام عليكم اخي الكريم
بامكانك مراجعة هذا الرابط
https://community.oracle.com/thread/2163549?tstart=0

If a button is Mouse navigable and clicked with the mouse, the button "becomes" the item with the focus and therefore validation takes place on the item which was the current item before (Validation-triggers will fire). Also, navigation takes place and the navigation trigger fire. The WHEN-BUTTON-PRESSED-trigger will only fire when all these succeeds.

If a button which is not Mouse navigable is clicked with the mouse, the WHEN-BUTTON-PRESSED-trigger will fire immediately, the currently focussed item will stay focusses, no navigation ro validation takes place.
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Try this:
1. Create a Button in a form.
2. Select the Mouse Navigate property of the button in the Property Palette
3. Press F1 to open Mouse Navigate Property help

Basically, this property controls the cursor navigation for the button. When 'YES', Forms will physically move the cursor to the button before triggering the When-Button-Pressed trigger (there is a visual cue that the cursor is on the button). When 'NO', Forms will not move the cursor to the button, but will simply trigger the When-Button-Pressed trigger and the input focus (cursor) will stay whereever it was before you clicked on the button.

Typically, I have used this property when I have a When-Validate-Item trigger on a field and button that will perform an action on the item (or other items) and I don't want to a Validation event in a field to occur when I click on the button. The point is, I want to execute the code behind the button, but I don't want the cursor to move to the button, I want it to stay where it is.