[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] delight535:
Of course, here is my status_bar_expanded.xml:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout android:id="@id/notification_panel" android:background="@drawable/notification_panel_bg" android:paddingTop="@dimen/notification_panel_padding_top" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_marginLeft="@dimen/notification_panel_margin_left"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:systemui="http://schemas.android.com/apk/res/com.android.systemui">
<TextView android:textAppearance="@style/TextAppearance.StatusBar.Expanded.Network" android:gravity="center" android:layout_gravity="bottom" android:id="@id/carrier_label" android:visibility="invisible" android:layout_width="fill_parent" android:layout_height="@dimen/carrier_label_height" android:layout_marginBottom="@dimen/close_handle_height" />
<LinearLayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_marginBottom="@dimen/close_handle_underlap">
<include android:layout_width="fill_parent" android:layout_height="@dimen/notification_panel_header_height" layout="@layout/status_bar_expanded_header" />
<com.android.systemui.statusbar.powerwidget.PowerWidget android:id="@id/exp_power_stat" android:layout_width="fill_parent" android:layout_height="@dimen/notification_panel_widget_height" />
<TextView android:textAppearance="@style/TextAppearance.StatusBar.Expanded.Network.EmergencyOnly" android:gravity="center" android:id="@id/emergency_calls_only" android:paddingBottom="4.0dip" android:visibility="gone" android:layout_width="fill_parent" android:layout_height="wrap_content" />
<ScrollView android:id="@id/scroll" android:fadingEdge="none" android:layout_width="fill_parent" android:layout_height="fill_parent" android:overScrollMode="always">
<com.android.systemui.statusbar.policy.NotificationRowLayout android:id="@id/latestItems" android:layout_width="fill_parent" android:layout_height="wrap_content" systemui:rowHeight="@dimen/notification_row_min_height" />
</ScrollView>
</LinearLayout>
<com.android.systemui.statusbar.phone.CloseDragHandle android:layout_gravity="bottom" android:orientation="vertical" android:id="@id/close" android:layout_width="fill_parent" android:layout_height="@dimen/close_handle_height">
<ImageView android:layout_gravity="bottom" android:layout_width="fill_parent" android:layout_height="@dimen/close_handle_height" android:src="@drawable/status_bar_close" android:scaleType="fitXY" />
</com.android.systemui.statusbar.phone.CloseDragHandle>
</FrameLayout>

And this is my status_bar_expanded_header.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:gravity="center_vertical" android:orientation="horizontal" android:background="@drawable/notification_header_bg" android:layout_width="fill_parent" android:layout_height="wrap_content" android:baselineAligned="false"
xmlns:android="http://schemas.android.com/apk/res/android">
<com.android.systemui.statusbar.policy.Clock android:textAppearance="@style/TextAppearance.StatusBar.Expanded.Clock" android:id="@id/clock" android:clickable="true" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="8.0dip" android:singleLine="true" />
<com.android.systemui.statusbar.policy.DateView android:textAppearance="@style/TextAppearance.StatusBar.Expanded.Date" android:id="@id/date" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="8.0dip" android:layout_marginRight="8.0dip" />
<LinearLayout android:id="@id/buttons_bar" android:layout_width="wrap_content" android:layout_height="wrap_content">
<com.android.systemui.statusbar.RotationToggle android:id="@id/rotation_lock_button" android:clickable="true" android:layout_width="32.0dip" android:layout_height="32.0dip" android:layout_margin="8.0dip" android:button="@drawable/ic_notify_rotation" android:contentDescription="@string/accessibility_rotation_lock_off" />
<ImageView android:id="@id/settings_button" android:layout_width="48.0dip" android:layout_height="48.0dip" android:src="@drawable/ic_notify_quicksettings" android:scaleType="center" android:contentDescription="@string/accessibility_settings_button" />
</LinearLayout>
<Space android:layout_width="0.0dip" android:layout_height="0.0dip" android:layout_weight="1.0" />
<ImageView android:id="@id/clear_all_button" android:layout_width="48.0dip" android:layout_height="48.0dip" android:src="@drawable/ic_notify_clear" android:scaleType="center" android:contentDescription="@string/accessibility_clear_all" />
</LinearLayout>

These are the original files from the SystemUI.apk, I did not modify anything about them. I only edited the status_bar.xml.

Thank you for your help!

PS: I also tried a modified SystemUI.apk by other users: http://xdaforums.com/showthread.php?t=1854602. You can find it on the link, by the attachments. The clock is centered, and the battery percentage is a little big higher than it is usually. And the same issue is happening with that SystemUI.apk as well. It is also buggy, when expanded.